Neurologia medico-chirurgica
Online ISSN : 1349-8029
Print ISSN : 0470-8105
ISSN-L : 0470-8105
Case Reports
Acquired Chiari Malformation Secondary to Atlantoaxial Vertical Subluxation in a Patient With Rheumatoid Arthritis Combined With Atlanto-occipital Assimilation
—Case Report—
Yuiko KIMURAAtsushi SEICHIAkira GOMIMasahiro KOJIMAHirokazu INOUEAtsushi KIMURA
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2012 Volume 52 Issue 9 Pages 683-686


A 65-year-old woman with a history of rheumatoid arthritis presented with a rare case of acquired Chiari malformation secondary to atlantoaxial vertical subluxation, associated with congenital atlanto-occipital assimilation. Syringomyelia and tetraparesis improved immediately after posterior fossa decompression and simultaneous occipito-cervical junction fusion. The progression of acquired Chiari malformation is not well known. We concluded that coexisting assimilation accelerated crowded foramen magnum following atlantoaxial vertical subluxation and induced acquired Chiari malformation over the course of a few years.

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© 2012 by The Japan Neurosurgical Society

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